What does the root word believe mean?

The root word "believe" is actually the whole word itself. It doesn't have a separate root word.

However, it does have related words that help us understand its meaning:

* belief: The state of holding something to be true.

* believable: Something that is likely to be true or accepted as true.

* unbelievable: Something that is not likely to be true or difficult to accept.

Therefore, "believe" essentially means to accept something as true, whether based on evidence, trust, or faith.